JP6566410B2 - Data processing method, base station, and user equipment - Google Patents

Description

  This application claims priority to Chinese Patent Application No. 201510700640.8 entitled “DATA PROCESSING METHOD, BASE STATION, AND USER EQUIPMENT” filed with the Chinese Patent Office on October 26, 2015, which is incorporated by reference in its entirety. Incorporated herein.

  The present invention relates to the field of communication technology, and in particular, to a data processing method, a base station, and user equipment.

  Long Term Evolution (LTE) networks are rapidly evolving from independent stations to cooperating stations. Common technologies include 2-cell joint transmission (JT for short), Single Frequency Network (SFN for short), Dynamic Point Selection (DPS for short), carrier aggregation ( Carrier Aggregation (CA for short), Coordinated Scheduling-based Power Control (CSPC for short), and the like.

  An important basis for cooperation between stations is the interconnection between stations. Currently, frequently used methods are fiber interconnects and normal Internet Protocol (IP for short) network interconnects. The advantage of fiber interconnect is a small delay (eg, the delay can be less than 100 nanoseconds). However, the cost of fiber interconnect projects is high and operators who have not previously laid the fiber need to install a new fiber. The advantage of IP interconnection is low cost, and existing transmission networks can be used without being reconstructed. However, the delay of data transmission is large, and there is generally a delay of 2 to 8 milliseconds. If the delay is too large, hybrid automatic repeat request (HARQ for short) feedback is not provided in a timely manner, and there is a problem that HARQ multiplexing gain cannot be obtained.

  The processing procedure of one HARQ process when the transmission delay between stations is not considered is shown in Fig. 1-a. FIG. 1A is a schematic diagram showing a processing procedure of one HARQ process when the transmission delay between stations in the prior art is not considered. The processing procedure can mainly include the following steps.

  Step 1: A secondary carrier cell (secondary carrier cell, SCC for short) distributes a downlink permission to user equipment (User Equipment, abbreviated UE), and the permission is a downlink permission of HARQ process 0. After receiving the permission, the UE demodulates the corresponding data at the frequency domain position of the permission, performs a cyclic redundancy check (CRC for short) process, and obtains a check result.

  Step 2: Four milliseconds after the UE receives the downlink grant, the UE needs to feed back the reception result of the HARQ process 0 downlink grant corresponding to time 0 to the base station.

  Step 3: The base station receives HARQ process 0 feedback using a primary carrier cell (PCC for short) and performs demodulation processing.

  Step 4: Since the transmission delay between the base stations is not taken into account, after the base station completes demodulation, the base station simultaneously transmits HARQ process 0 feedback to the SCC using PCC. For example, the base station completes demodulation at time 7, and the base station sends HARQ process 0 feedback to the SCC at time 7.

  Step 5: At the time of the new downlink scheduling, the SCC finds that HARQ process 0 is available and continues to use HARQ process 0 to complete the downlink grant.

  The above procedure applies to all eight HARQ processes in an ideal backhaul. As shown in FIG. 1B, FIG. 1B is a schematic diagram of the processing procedures of eight HARQ processes when the transmission delay between stations is not considered in the prior art. Different arrow symbols represent different HARQ processes. From Figure 1-b, if there is no transmission delay between stations, the feedback of each HARQ process can be sent to the SCC in a timely manner, each millisecond can be scheduled, and each HARQ process is multiplexed on the SCC side It can be seen that the gain can be increased.

  In the process of implementing the present invention, the inventor found that the prior art can only be applied when there is no transmission delay between stations, but in an actual application scenario there is generally a transmission delay between stations. FIG. 1-c shows a processing procedure when the transmission delay between stations is not ideal, for example, when it is 4 milliseconds. FIG. 1-c is a schematic diagram showing the processing procedures of eight HARQ processes when considering the transmission delay between stations in the prior art. The processing procedure can mainly include the following steps.

  The first three steps are similar to Step 1, Step 2, and Step 3 shown in FIG.

  Step 4: The transmission delay between stations is 4 ms, so there is a 4 ms delay to feed back information to the SCC, and the HARQ process available in 8 ms, 9 ms, and 10 ms Because there is no, SCC cannot execute scheduling. Therefore, in existing technical solutions, the longer the transmission delay between stations, the longer the latency of the HARQ process, the longer the time during which users cannot be scheduled, and the waste of air interface resources.

  Embodiments of the present invention provide a data processing method, a base station, and user equipment, and realize both UE full scheduling and HARQ process multiplexing gain when there is a transmission delay between stations between base stations be able to.

  In order to solve the above technical problem, the embodiment of the present invention provides the following technical solution.

According to a first aspect, an embodiment of the present invention provides a data scheduling method, which comprises:
The first base station allows the first downlink grant and the first downlink data to be transmitted to the user equipment (TTI) at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process. UE), wherein the first downlink data carries a first new data indicator (NDI) in a first state;
Transmitting, by a first base station, a second downlink grant and second downlink data to a UE in a second TTI using a second HARQ process, wherein the second downlink Data carries a second NDI in a second state; and
Transmitting, by a first base station, a third downlink grant and third downlink data to a UE at a third TTI using a first HARQ process, wherein the third downlink The data carries a first NDI in a third state, wherein the third state is obtained by inverting the first state of the first NDI; and
The first base station receives the second feedback result transmitted by the second base station and corresponding to the second downlink data at the fourth TTI, and the first base station receives the second feedback result. Transmitting the fourth downlink grant and retransmitted second downlink data to the UE at the fourth TTI using the second HARQ process according to the negative acknowledgment (NACK) information included in the feedback result The retransmitted second downlink data carries the second NDI in the second state and there is a transmission delay between the second base station and the first base station, Includes steps and.

With respect to the first aspect, in a first possible implementation of the first aspect, the method comprises:
The first base station receives the first feedback result transmitted by the second base station and corresponding to the first downlink data at the fifth TTI, and the first base station receives the first feedback Transmitting the fifth downlink grant and retransmitted first downlink data to the UE in a fifth TTI using the first HARQ process according to the NACK information included in the feedback result, comprising: The retransmitted first downlink data carries the first NDI in the first state, the first state is obtained by inverting the third state of the first NDI, and the fourth TTI The time difference with the second TTI further includes a step equal to the time difference between the fifth TTI and the first TTI.

As for the first aspect, in a second possible implementation of the first aspect, the first base station uses the first HARQ process for the third downlink grant and the third downlink data. After the step of transmitting to the UE with a third TTI, the method comprises:
Transmitting, by a first base station, a sixth downlink grant and fourth downlink data to a UE in a sixth TTI using a first HARQ process, wherein the fourth downlink The data further comprises a step of carrying a first NDI in a first state, wherein the first state is obtained by inverting the third state of the first NDI.

With respect to the first aspect, or the first or second possible implementation of the first aspect, in a third possible implementation of the first aspect, the third downlink grant by the first base station And transmitting the third downlink data to the UE at the third TTI using the first HARQ process,
If the first base station determines that there is no HARQ process available at the third TTI, the first base station sends the third downlink grant and the third downlink data to the virtual HARQ process. And transmitting to the UE at a third TTI using the virtual HARQ process corresponding to the first HARQ process.

With respect to the first aspect, or the first or second possible implementation of the first aspect, in the fourth possible implementation of the first aspect, by the first base station, by the second base station After receiving the second feedback result transmitted and corresponding to the second downlink data at the fourth TTI, the method comprises:
According to the acknowledgment (ACK) information included in the second feedback result by the first base station, the fourth downlink grant and the fifth downlink data are transmitted using the second HARQ process to the fourth Transmitting to the UE with TTI, the fifth downlink data carries the second NDI in the fourth state, and the fourth state is by reversing the second state of the second NDI The obtained step further includes:

According to a second aspect, an embodiment of the present invention further provides a data processing method, the method comprising:
User equipment (UE) receives a first downlink grant transmitted by a first base station at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process And demodulating the first downlink data transmitted by the first base station according to the first downlink grant, and providing the first feedback result corresponding to the first downlink data to the second base station Transmitting, wherein there is a transmission delay between the second base station and the first base station, and the first downlink data is a first new data indicator (NDI) in a first state. Step)
The second downlink grant transmitted by the first base station by the UE is received at the second TTI using the second HARQ process, and according to the second downlink grant, the first base station Demodulating the second downlink data transmitted by the second downlink data and transmitting a second feedback result corresponding to the second downlink data to the second base station, wherein the second downlink data is Carrying a second NDI in a state of 2, and
The UE receives the third downlink grant transmitted by the first base station at the third TTI using the first HARQ process and, according to the third downlink grant, the first base station Demodulating the third downlink data transmitted by the second base station and transmitting a third feedback result corresponding to the third downlink data to the second base station, wherein the third downlink data is Carrying the first NDI in the state of 3; and
The UE receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process and, according to the fourth downlink grant, the first base station Demodulating the retransmitted second downlink data transmitted by, and transmitting a fourth feedback result corresponding to the retransmitted second downlink data to the second base station, The generated second downlink data includes carrying a second NDI in a second state.

With respect to the second aspect, in a first possible implementation of the second aspect, the method comprises:
The UE receives the fifth downlink grant transmitted by the first base station at the fifth TTI using the first HARQ process and, according to the fifth downlink grant, the first base station Demodulating the retransmitted first downlink data transmitted by the method, wherein the retransmitted first downlink data carries a first NDI in a first state.

With respect to the second aspect, in a second possible implementation of the second aspect, the UE transmits the fourth downlink grant transmitted by the first base station using the second HARQ process. Before the step of receiving at 4 TTI, the method is
The UE receives the sixth downlink grant sent by the first base station at the sixth TTI using the first HARQ process and, according to the sixth downlink grant, the first base station Further demodulating the fourth downlink data transmitted by the fourth downlink data carrying the first NDI in the first state.

With respect to the second aspect, or the first or second possible implementation of the second aspect, in a third possible implementation of the second aspect, the UE transmitted by the first base station by the UE Receiving a downlink grant of 3 at a third TTI using the first HARQ process,
Receiving, by a UE, a third downlink grant transmitted by a first base station at a third TTI using a virtual HARQ process, the virtual HARQ process corresponding to the first HARQ process; Including steps.

With respect to the second aspect, or the first or second possible implementation of the second aspect, in a fourth possible implementation of the second aspect, the UE transmitted by the first base station by the UE After receiving 4 downlink grants at a fourth TTI using a second HARQ process, the method comprises:
Demodulating the fifth downlink data transmitted by the first base station according to the fourth downlink grant by the UE, wherein the fifth downlink data is the second NDI in the fourth state; The method further includes the step of transporting.

With respect to the second aspect, or the first or second possible implementation of the second aspect, in the fifth possible implementation of the second aspect, according to the third downlink grant, the first base station Demodulating the third downlink data transmitted by
Receiving, by the UE, third downlink data according to an air interface resource indicated by the third downlink grant;
The UE clears the first downlink data stored in the cache corresponding to the first HARQ process according to the first NDI in the third state carried in the third downlink data, and the first Writing third downlink data to a cache corresponding to the HARQ process.

With respect to the second aspect, or the first or second possible implementation of the second aspect, in a sixth possible implementation of the second aspect, the first base station according to a fourth downlink grant Demodulating the retransmitted second downlink data transmitted by
Receiving, by the UE, the retransmitted second downlink data according to the air interface resource indicated by the fourth downlink grant;
The UE has retransmitted the second downlink data stored in the cache corresponding to the second HARQ process according to the second NDI in the second state carried by the retransmitted second downlink data. combined with the second downlink data, and a step of writing the synthesis results to the cache corresponding to the second HARQ process.

According to a third aspect, an embodiment of the present invention further provides a base station, in particular the base station is a first base station, and the first base station is
Send first downlink grant and first downlink data to user equipment (UE) at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process A first data processing module configured, wherein the first downlink data carries a first new data indicator (NDI) in a first state;
A second data processing module configured to transmit a second downlink grant and second downlink data to the UE in a second TTI using a second HARQ process, the second data processing module comprising: A second data processing module carrying the second NDI in the second state,
A third data processing module configured to transmit a third downlink grant and third downlink data to the UE in a third TTI using a first HARQ process, the third data processing module comprising: A third data processing module, wherein the downlink data carries a first NDI in a third state, wherein the third state is obtained by inverting the first state of the first NDI;
The second feedback result transmitted by the second base station and corresponding to the second downlink data is received at the fourth TTI, and the second feedback result is received according to the negative acknowledgment (NACK) information included in the second feedback result. A fourth data processing module configured to transmit 4 downlink grants and retransmitted second downlink data to the UE in a fourth TTI using a second HARQ process; The retransmitted second downlink data carries the second NDI in the second state, and the fourth data has a transmission delay between the second base station and the first base station. And processing modules.

With respect to the third aspect, in a first possible implementation of the third aspect, the first base station is:
The first downlink result transmitted by the second base station and corresponding to the first downlink data is received at the fifth TTI, and according to the NACK information included in the first feedback result, the fifth downlink A fifth data processing module configured to transmit the permitted and retransmitted first downlink data to the UE at a fifth TTI using a first HARQ process, wherein 1 downlink data carries the first NDI in the first state, the first state is obtained by inverting the third state of the first NDI, the fourth TTI and the second TTI Further includes a fifth data processing module equal to the time difference between the fifth TTI and the first TTI.

With respect to the third aspect, in a second possible implementation of the third aspect, the first base station is:
After the third data processing module transmits the third downlink grant and the third downlink data to the UE at the third TTI using the first HARQ process, the sixth downlink grant and A sixth data processing module configured to transmit the fourth downlink data to the UE at a sixth TTI using the first HARQ process, wherein the fourth downlink data is the first The first data processing module further includes a sixth data processing module that is obtained by inverting the third state of the first NDI.

  With respect to the third aspect, or the first or second possible implementation of the third aspect, in the third possible implementation of the third aspect, the third data processing module is the first base station If the third TTI determines that there is no HARQ process available, it sends the third downlink grant and third downlink data to the UE at the third TTI using the virtual HARQ process. And the virtual HARQ process corresponds to the first HARQ process.

  With respect to the third aspect, or the first or second possible implementation of the third aspect, in a fourth possible implementation of the third aspect, transmitted by the second base station and second down After receiving the second feedback result corresponding to the link data at the fourth TTI, the fourth data processing module performs the fourth downlink according to the acknowledgment (ACK) information included in the second feedback result. The grant and the fifth downlink data are further configured to send to the UE at the fourth TTI using the second HARQ process, and the fifth downlink data is the second state in the fourth state. Transporting NDI, the fourth state is obtained by inverting the second state of the second NDI.

According to a fourth aspect, an embodiment of the present invention further provides user equipment, the user equipment comprising:
A first downlink grant transmitted by a first base station is received at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process and the first downlink Configured to demodulate the first downlink data transmitted by the first base station and transmit a first feedback result corresponding to the first downlink data to the second base station according to the grant A first data processing module, wherein there is a transmission delay between the second base station and the first base station, and the first downlink data is the first new data in the first state A first data processing module carrying an indicator (NDI);
The second downlink grant transmitted by the first base station is received at the second TTI using the second HARQ process and transmitted by the first base station according to the second downlink grant. A second data processing module configured to demodulate the second downlink data and transmit a second feedback result corresponding to the second downlink data to the second base station, A second data processing module carrying the second NDI in the second state, the second data processing module;
The third downlink grant transmitted by the first base station is received at the third TTI using the first HARQ process and transmitted by the first base station according to the third downlink grant. A third data processing module configured to demodulate the third downlink data and transmit a third feedback result corresponding to the third downlink data to the second base station, A third data processing module carrying the first NDI in the third state, the third downlink data; and
The fourth downlink grant transmitted by the first base station is received at the fourth TTI using the second HARQ process and transmitted by the first base station according to the fourth downlink grant. Further, the fourth data configured to demodulate the retransmitted second downlink data and transmit the fourth feedback result corresponding to the retransmitted second downlink data to the second base station. And a fourth data processing module that carries the second NDI in the second state, wherein the second downlink data retransmitted is a processing module.

With respect to the fourth aspect, in a first possible implementation of the fourth aspect, the user equipment is:
The fifth downlink grant transmitted by the first base station is received at the fifth TTI using the first HARQ process and transmitted by the first base station according to the fifth downlink grant. A fifth data processing module configured to demodulate the retransmitted first downlink data, wherein the retransmitted first downlink data carries the first NDI in the first state The data processing module further includes a fifth data processing module.

  With respect to the fourth aspect, in a second possible implementation of the fourth aspect, the user equipment allows the fourth data processing module to grant the fourth downlink grant transmitted by the first base station, Receives the sixth downlink grant sent by the first base station at the sixth TTI using the first HARQ process before receiving at the fourth TTI using the second HARQ process And a sixth data processing module configured to demodulate the fourth downlink data transmitted by the first base station according to a sixth downlink grant, wherein the fourth downlink data is It further includes a sixth data processing module that carries the first NDI in the first state.

  With respect to the fourth aspect, or the first or second possible implementation of the fourth aspect, in the third possible implementation of the fourth aspect, the third data processing module is the first base station Is specifically configured to receive at a third TTI using a virtual HARQ process, the virtual HARQ process corresponding to the first HARQ process.

  With respect to the fourth aspect, or the first or second possible implementation of the fourth aspect, in the fourth possible implementation of the fourth aspect, the fourth data processing module is the fourth downlink Pursuant to the grant, further configured to demodulate the fifth downlink data transmitted by the first base station, the fifth downlink data carries a second NDI in a fourth state.

With respect to the fourth aspect, or the first or second possible implementation of the fourth aspect, in the fifth possible implementation of the fourth aspect, the third data processing module is the third downlink According to the air interface resource indicated by the grant, the third downlink data is received and in the cache corresponding to the first HARQ process according to the first NDI in the third state carried in the third downlink data Specifically configured to clear the stored first downlink data and write the third downlink data to a cache corresponding to the first HARQ process.

With respect to the fourth aspect, or the first or second possible implementation of the fourth aspect, in the sixth possible implementation of the fourth aspect, the fourth data processing module is the fourth downlink According to the air interface resource indicated by the grant, the second HARQ is received according to the second NDI in the second state, which receives the retransmitted second downlink data and is carried in the retransmitted second downlink data. Specifically configured to combine the second downlink data stored in the cache corresponding to the process with the retransmitted second downlink data and write the combined result to the cache corresponding to the second HARQ process. The

  From the above technical solution, it can be seen that embodiments of the present invention have the following advantages.

  In an embodiment of the present invention, the first base station transmits the first downlink grant and the first downlink data to the UE at the first TTI using the first HARQ process, and the first The downlink data carries the first NDI in the first state, and the first base station uses the second HARQ process to send the second downlink grant and the second downlink data. Transmitted to the UE with a TTI of 2, the second downlink data carries the second NDI in the second state, and the first base station transmits the third downlink grant and the third downlink data , Using the first HARQ process to transmit to the UE in the third TTI, the third downlink data carries the first NDI in the third state, the third state is the first NDI The first base station is obtained by inverting the first state, and the first base station transmits a second field corresponding to the second downlink data transmitted by the second base station. The first base station receives the backback result in the fourth TTI, and the first base station grants the fourth downlink grant and retransmitted second downlink according to the negative acknowledgment (NACK) information included in the second feedback result. The data is transmitted to the UE at the fourth TTI using the second HARQ process, and the retransmitted second downlink data carries the second NDI in the second state, and the second base station The transmission delay between stations between the first TTI and the first base station is the time difference between the fourth TTI and the first TTI. In an embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

  BRIEF DESCRIPTION OF THE DRAWINGS To describe the technical solutions in the prior art and the embodiments of the present invention more clearly, the following briefly describes the accompanying drawings necessary for describing the prior art and the present embodiments. Of course, the accompanying drawings in the following description show only some embodiments of the present invention, and those skilled in the art can further derive other drawings from these accompanying drawings.

FIG. 10 is a schematic diagram showing a processing procedure of one HARQ process when a transmission delay between stations in the prior art is not considered. It is a schematic diagram which shows the process sequence of eight HARQ processes when the transmission delay between the stations of a prior art is not considered. It is a schematic diagram which shows the process sequence of eight HARQ processes when the transmission delay between the stations of a prior art is considered. It is a schematic block diagram which shows the procedure of the data processing method by one Embodiment of this invention. It is a schematic block diagram which shows the procedure of another data processing method by one Embodiment of this invention. It is a schematic diagram which shows the process sequence of one HARQ process when the transmission delay between the stations by one Embodiment of this invention is considered. It is a schematic block diagram of the base station by one Embodiment of this invention. It is a schematic block diagram of another base station by one Embodiment of this invention. It is a schematic block diagram of another base station by one Embodiment of this invention. It is a schematic block diagram of the user equipment by one Embodiment of this invention. It is a schematic block diagram of another user equipment by one Embodiment of this invention. It is a schematic block diagram of another user equipment by one Embodiment of this invention. It is a schematic block diagram of another base station by one Embodiment of this invention. It is a schematic block diagram of another user equipment by one Embodiment of this invention.

  Embodiments of the present invention provide a data processing method, a base station, and user equipment, and realize both UE full scheduling and HARQ process multiplexing gain when there is a transmission delay between stations between base stations be able to.

  In order to make the objectives, features and advantages of the present invention clearer and more understandable, the technical solutions in the embodiments of the present invention will be more clearly and sufficiently referred to the accompanying drawings in the embodiments of the present invention. Is described below. Of course, the embodiments described below are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention shall fall within the protection scope of the present invention.

  In the specification, claims, and accompanying drawings of the present invention, terms such as “first”, “second” and the like are intended to distinguish similar objects, but not necessarily in a specific order or arrangement. It is not shown. The terminology used in such a method is interchangeable in appropriate situations, and this is just an identification method used when objects with the same attributes are described in the embodiments of the present invention. I want you to understand. Further, the term “include, contain” and any other variations are meant to cover non-exclusive inclusions, so that a process, method, system, product, or device that includes a series of units is Although not necessarily limited to those units, other units not specifically enumerated or not unique to such processes, methods, systems, products, or devices may be included.

  Details are described separately.

  An embodiment of the present invention provides a data processing method, and the data processing method can be applied to a scenario in which a base station transmits data to a UE using a HARQ process. With reference to FIG. 2, the data processing method provided in the embodiment of the present invention may include the following steps.

  201. The first base station uses the first HARQ process to send the first downlink grant and the first downlink data to the UE at a first transmission time interval (TTI for short). However, the first downlink data carries a first new data indicator (NDI for short) in a first state.

  In this embodiment of the present invention, the first base station transmits downlink grant and downlink data to the UE in one TTI using one HARQ process. In order to distinguish different TTIs, the following different TTIs in this embodiment of the present invention are the first TTI, second TTI, third TTI, fourth TTI, fifth TTI, sixth, respectively. Defined as TTI etc. Furthermore, the downlink grants transmitted by the first base station with different TTIs are respectively the first downlink grant, the second downlink grant, the third downlink grant, the fourth downlink grant, the fifth Defined as a downlink permission, a sixth downlink permission, and the like. In order to distinguish different downlink data, the following different downlink data in this embodiment of the present invention are respectively the first downlink data, the second downlink data, the third downlink data, the fourth Defined as downlink data. Similarly, in this embodiment of the present invention, NDIs corresponding to different HARQ processes are defined in different ways, for example, NDIs corresponding to the first HARQ process are corresponded to the first NDI and the second HARQ process. The NDI to be defined is defined as the second NDI.

  In this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. The first HARQ process is used for the initial transmission of the HARQ process only when there are not enough HARQ processes and is used to guarantee full scheduling of the UE. The first HARQ process is also referred to as a normal HARQ process. Full scheduling means that the UE receives a downlink grant at each TTI, and thus the HARQ process can be used to implement full scheduling of the UE. The second HARQ process retains the HARQ multiplexing gain in any case, and the second HARQ process is also referred to as a multiplexed HARQ process. In this embodiment of the invention, a combination of two types of HARQ processes is used to perform full scheduling and obtain the effect of HARQ multiplexing gain. For example, the protocol specifies that there are eight HARQ processes: HARQ process 0, HARQ process 1, HARQ process 2,..., And HARQ process 7. The eight HARQ processes are classified into two types. HARQ process 0 is a first HARQ process, and HARQ processes 1 to 7 are second HARQ processes. The HARQ processes 1 to 7 wait for feedback information of initial transmission scheduling and determine whether to perform retransmission. In this case, if the initial transmission fails in the HARQ processes 1 to 7, there is a possibility that retransmission will be performed. Therefore, there is a retransmission gain in the second HARQ processes 1 to 7. Since there is a time difference due to transmission delay between base stations, and HARQ processes 1-7 send feedback from one station to another, the UE does not have scheduling resources available for a certain period In this case, the HARQ process 0 can perform full scheduling of the user equipment. In other embodiments of the present invention, HARQ processes 0 and 1 may be used as the first HARQ process and HARQ processes 2-7 may be used as the second HARQ process. Alternatively, the HARQ processes 0, 1, and 2 can be used as the first HARQ process, and the HARQ processes 3 to 7 can be used as the second HARQ process. The particular implementation may be determined according to the application scenario, which is used for illustration only and is not intended to be limiting.

In this embodiment of the invention, each HARQ process has a unique NDI, and all downlink data transmitted using the HARQ process carries the NDI. An NDI can include two states, for example, a first NDI includes a first state and a third state, and a second NDI includes a second state and a fourth state. For example, the NDI is 1 bit, each HARQ process has a unique NDI, and when the HARQ process is in the initial transmission stage, the NDI is inverted (eg, inverted from 0 to 1 or from 1 When the HARQ process is in the retransmission stage, the NDI is not changed and is not reversed.

  In this embodiment of the present invention, using the first HARQ process, the first base station transmitting the first downlink grant and the first downlink data to the UE includes the first HARQ process. Using the first base station to send the first downlink grant to the UE and then send the first downlink data to the UE in the frequency domain position indicated by the first downlink grant . The UE may receive first downlink data transmitted by the first base station according to the determined first downlink grant. Also, the first base station sends a second downlink grant, a third downlink grant, a fourth downlink grant, a fifth downlink grant, a sixth downlink grant, and downlink data The same applies to the case of transmitting, and details are not described.

  202. The first base station transmits a second downlink grant and second downlink data to the UE in a second TTI using a second HARQ process, and the second downlink data is second The second NDI in the state of is conveyed.

  In this embodiment of the present invention, in the previous step 201, the first base station uses the first HARQ process to UE the first downlink grant and the first downlink data in the first TTI. In step 202, the base station uses the second HARQ process provided in this embodiment of the present invention to define another time point (defined as the second TTI) that is different from the first TTI. To transmit the second downlink grant and the second downlink data to the UE, and the second downlink data carries the second NDI in the second state. The second NDI carried by the second downlink data includes two states, a second state and a fourth state. The fourth state may be an inversion of the second state in the second NDI, and the second state may be an inversion of the fourth state. The second NDI is used to indicate to the UE whether the data for this HARQ process was first transmitted or retransmitted. If the value of the downlink data stored in the cache corresponding to the second HARQ process is different from the value of the second NDI, the UE considers that an initial transmission has occurred at this time, otherwise the UE Consider resending. If the UE determines that retransmission has been performed at this time, the UE can synthesize HARQ and obtain the multiplexing gain of the HARQ process. In this embodiment of the invention, it is mentioned that the first HARQ process is used to perform full scheduling of the UE and the second HARQ process is used to realize the multiplexing gain of the HARQ process. From the description of the contents of Thus, from the description of step 201 and step 202, the UE can use two different HARQ processes with two different TTIs respectively, and transmit downlink data to the UE using both of the two types of HARQ processes. I understand that I can do it. By using two types of HARQ processes, not only full scheduling can be guaranteed, but also HARQ multiplexing gain can be obtained.

  203. The first base station uses the first HARQ process to send the third downlink grant and the third downlink data to the UE at the third TTI, and the third downlink data is the third The first NDI in the state is conveyed, and the third state is obtained by inverting the first state of the first NDI.

  In this embodiment of the invention, it can be seen from the previous step 201 and step 202 that the first base station individually transmits the first downlink data and the second downlink data to the UE. In the case of an inter-station cooperation implementation scenario, for example, a carrier aggregation scenario, the first base station is an SCC base station, and the second base station is a PCC base station. The UE receives the first downlink data, the UE transmits a first feedback result corresponding to the first downlink data to the second base station, and then the second base station receives the first feedback The result is transmitted to the first base station. Similarly, the UE receives the second downlink data, the UE transmits a second feedback result corresponding to the second downlink data to the second base station, and then the second base station The feedback result of 2 is transmitted to the first base station. In the inter-station cooperation scenario between two base stations, there is certainly a transmission delay between the second base station and the first base station. Therefore, after the first base station transmits the first downlink data to the UE with the first TTI, before the first base station receives the first feedback result, the first base station uses Without a possible HARQ process, the first base station can use the first HARQ process to send downlink data to the UE and perform full scheduling of the UE. For example, assuming that the third TTI is a TTI after the first TTI and the first base station does not receive the first feedback result at the third TTI, the first base station The HARQ process is used again to send the third downlink grant and third downlink data to the UE to perform full scheduling of the UE. From step 201, the first NDI corresponding to the first HARQ process is in the first state and uses the first HARQ process again, and the first TTI is followed by the first TTI and the third TTI. When transmitting third downlink data different from the link data, it is necessary to perform a state inversion for the first NDI corresponding to the first HARQ process, i.e. the first in the third state. It can be seen that the NDI needs to be carried in the third downlink data, and that the third state is obtained by inverting the first state of the first NDI.

  In some embodiments of the invention, the first base station transmits the first downlink data to the UE at the first TTI, and the first base station receives the second TTI at the second TTI, A first feedback result transmitted by the base station and corresponding to the first downlink data is received. The fifth TTI is after the first TTI and the fifth TTI is after the third TTI. The data processing method provided in this embodiment of the present invention may further include the following steps.

  A1. The first base station receives, at a fifth TTI, a first feedback result transmitted by the second base station and corresponding to the first downlink data, and the first base station 5th TTI using HARQ process, 5th downlink grant and retransmitted 1st downlink data according to Negative Acknowledgment (NACK for short) information contained in 1st feedback result The first downlink data transmitted to the UE and retransmitted carries the first NDI in the first state, the first state is obtained by inverting the third state of the first NDI, The time difference between the fourth TTI and the second TTI is equal to the time difference between the fifth TTI and the first TTI.

  After the first base station transmits the first downlink data at the first TTI, before the first base station receives the first feedback result at the fifth TTI, the first base station The third downlink data is transmitted in the third TTI, and full scheduling of the UE is performed. After the first base station receives the first feedback result at the fifth TTI, the first base station can obtain the reception status of the first feedback result by the UE, i.e., the first base station The station can know whether the UE has correctly received the first downlink data. If the UE correctly receives the first downlink data, the first feedback result includes ACKnowledgment (ACK for short) information. If the UE receives the first downlink data in error, the first feedback result includes NACK information. When NACK information is included in the first feedback result, the first base station needs to retransmit the first downlink data to the UE, that is, needs to execute Step A1. The first base station uses the first HARQ process to transmit the UE with the fifth downlink grant and the retransmitted first downlink data with the fifth TTI, and the retransmitted first downlink The link data carries the first NDI in the first state, and the first state is obtained by inverting the third state of the first NDI. From step 203, if the first NDI corresponding to the first HARQ process in the third TTI is in the third state and step A1 is executed, it corresponds to the first HARQ process in the third TTI. It can be seen that the first NDI needs to be further inverted, in which case the first NDI is inverted to the first state.

  In this embodiment of the invention, the first HARQ process is used to perform full scheduling of the UE, and thus the first base station transmits the first feedback result transmitted by the second base station. Note that prior to receiving, the first base station may perform full scheduling of the UE using the first HARQ multiple times to transmit new downlink data to the UE. For example, in some embodiments of the invention, a first base station transmits a third downlink grant and third downlink data to a UE at a third TTI using a first HARQ process After step 203, the data processing method provided in this embodiment of the present invention may further include the following steps.

  B1. The first base station transmits the sixth downlink grant and the fourth downlink data to the UE at the sixth TTI using the first HARQ process, and the fourth downlink data is the first The first NDI in the state is conveyed, and the first state is obtained by inverting the third state of the first NDI.

  After the first TTI, there is a sixth TTI in addition to the third TTI, and the sixth TTI is a TTI after the third TTI. Assuming that the first base station does not receive the first feedback result at the sixth TTI, the first base station again uses the first HARQ process to perform the sixth downlink grant and the fourth downlink. Transmit link data to perform full scheduling of the UE. From step 203, the first NDI corresponding to the first HARQ process in the third TTI is in the third state, and again uses the first HARQ process and the sixth TTI after the third TTI. When transmitting the fourth downlink data different from the third downlink data in the state, it is necessary to perform a state inversion for the first NDI corresponding to the first HARQ process, i.e., the first It can be seen that the first NDI in the state needs to be carried in the fourth downlink data, and that the first state is obtained by reversing the third state of the first NDI.

  In this embodiment of the present invention, after the first base station uses the first HARQ process to transmit the first downlink data to the UE, the first base station supports the first downlink data. Prior to receiving the first feedback result, the first base station performs full scheduling of the UE using the first HARQ process multiple times to transmit new downlink data to the UE. Note that you can.

  In some embodiments of the invention, the first base station transmits a third downlink grant and third downlink data to the UE at a third TTI using a first HARQ process 203. Specifically, the method may include the following steps.

  C1. If the first base station determines that there is no HARQ process available in the third TTI, the first base station uses the virtual HARQ process to grant the third downlink grant in the third TTI. And the third downlink data is transmitted to the UE, and the virtual HARQ process corresponds to the first HARQ process.

  From step 201 and step 202, the first base station transmits the first downlink data and the second downlink data using the first HARQ process and the second HARQ process, respectively, If the base station determines that there is no HARQ process available at the third TTI, the first base station uses the virtual HARQ process and the third downlink grant and third at the third TTI. And the virtual HARQ process corresponds to the first HARQ process. For example, in this embodiment of the present invention, if the downlink scheduling of the first base station is not full due to transmission delay between stations, multiple HARQ processes (eight HARQ processes are used as an example) are virtualized. The When the first base station scheduler finds that the actual HARQ process 0-7 is not available, it applies the HARQ process in the virtual HARQ process 8-15, and then the HARQ process is Mapping to a HARQ process (for example, modulo).

  204. The first base station receives the second feedback result transmitted by the second base station and corresponding to the second downlink data at the fourth TTI, and the first base station receives the second According to the NACK information included in the feedback result, the fourth downlink grant and the retransmitted second downlink data are transmitted to the UE at the fourth TTI using the second HARQ process, and the retransmitted second downlink data is transmitted. The second downlink data carries the second NDI in the second state.

  There is an inter-station transmission delay between the second base station and the first base station.

  In this embodiment of the present invention, the first base station transmits the second downlink data to the UE at the second TTI, and the first base station transmits the second base station at the fourth TTI. And receives a second feedback result corresponding to the second downlink data. The fourth TTI is after the second TTI, and the fourth TTI is after the third TTI. After the first base station transmits the second downlink data at the second TTI and before the first base station receives the second feedback result at the fourth TTI, the first base station The third downlink data is transmitted in the third TTI, and full scheduling of the UE is performed. After the first base station receives the second feedback result at the fourth TTI, the first base station can obtain the reception status of the second feedback result by the UE, i.e., the first base station The station can know whether the UE has correctly received the second downlink data. If the UE correctly receives the second downlink data, the second feedback result includes ACK information. If the UE receives the second downlink data in error, the second feedback result includes NACK information. If the second feedback result includes NACK information, the first base station needs to retransmit the second downlink data to the UE, ie, needs to perform step 204. The first base station uses the second HARQ process to transmit the fourth downlink grant and retransmitted second downlink data in the fourth TTI to the UE, and the retransmitted second downlink The link data carries the second NDI in the second state, and the state of the second NDI in the second TTI is the second state. Since the second downlink data needs to be retransmitted in the fourth TTI using the second HARQ process, the second NDI corresponding to the second HARQ process still maintains the second state, The UE decides that the first base station retransmits the second downlink data to the UE according to the second state used in the second NDI corresponding to the second HARQ process in the fourth TTI can do.

  In some embodiments of the present invention, step 204 describes the first base station implementation when the second feedback result received by the first base station is NACK information, and the second feedback If the result is ACK information, the data processing method provided in this embodiment of the present invention may further include the following steps.

  D1. After the first base station receives the second feedback result transmitted by the second base station and corresponding to the second downlink data at the fourth TTI, the first base station The fourth downlink grant and the fifth downlink data are transmitted to the UE in the fourth TTI using the second HARQ process according to the acknowledgment (ACK) information included in the feedback result of Downlink data carries the second NDI in the fourth state, which is obtained by inverting the second state of the second NDI.

  If the UE correctly receives the second downlink data, the second feedback result includes ACK information. If the second feedback result includes ACK information, the first base station can send new downlink data to the UE, i.e., the first base station needs to perform step D1, The one base station transmits the fourth downlink grant and the fifth downlink data to the UE in the fourth TTI using the second HARQ process. The fifth downlink data carries the second NDI in the fourth state, the second NDI corresponding to the second HARQ process in the second TTI is in the second state, and the new downlink data is Transmitted in the fourth TTI, the fourth state is obtained by inverting the second state of the second NDI.

  From the above example embodiment of the present invention, the first base station transmits the first downlink grant and the first downlink data to the UE in the first TTI using the first HARQ process. The first downlink data carries the first NDI in the first state, the first base station uses the second HARQ process, the second downlink grant and the second downlink data To the UE in the second TTI, the second downlink data carries the second NDI in the second state, and the first base station receives the third downlink grant and the third downlink Link data is sent to the UE in a third TTI using the first HARQ process, the third downlink data carries the first NDI in the third state, and the third state is the first Obtained by inverting the first state of the NDI, the first base station is transmitted by the second base station at the fourth TTI and into the second downlink data The first base station receives the corresponding second feedback result, and the first base station uses the second HARQ process in the fourth TTI according to the negative acknowledgment (NACK) information included in the second feedback result. 4 downlink grants and retransmitted second downlink data are transmitted to the UE, and the retransmitted second downlink data carries the second NDI in the second state, and the second base station It can be seen that the transmission delay between the stations with the first base station is the time difference between the fourth TTI and the first TTI. In this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

  In the above embodiment, the data processing method provided in one embodiment of the present invention has been described on the first base station side, but in the following, the data processing method provided in the embodiment of the present invention is described in the first This will be explained on the UE side that interacts with the base station. With reference to FIG. 3, another data processing method provided in this embodiment of the present invention may specifically include the following steps.

  301. The UE receives the first downlink grant transmitted by the first base station at the first TTI using the first HARQ process and, according to the first downlink grant, by the first base station Demodulate the transmitted first downlink data, send the first feedback result corresponding to the first downlink data to the second base station, between the second base station and the first base station There is a transmission delay between the stations, and the first downlink data carries the first NDI in the first state.

  In this embodiment of the invention, the first base station transmits a first downlink grant to the UE with a first TTI using a first HARQ process, and the UE performs the first HARQ process. Use to receive the first downlink grant on the first TTI. The UE determines a frequency domain location from which the first base station transmits the first downlink data from the first downlink grant, and then the UE first downlink according to the first downlink grant Demodulate the data. The UE generates a first feedback result according to a reception situation of the first downlink data, and then transmits a first feedback result corresponding to the first downlink data to the second base station. For example, if the UE correctly receives the first downlink data, the first feedback result includes ACK information, or if the UE receives the first downlink data incorrectly, the first feedback result is NACK. Contains information. In addition, the UE transmits the first downlink data first or the first downlink data according to the state of the first NDI carried in the first downlink data. It can be decided whether to retransmit.

  In this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. The first HARQ process is used for the initial transmission of the HARQ process only when there are not enough HARQ processes and is used to guarantee full scheduling of the UE. The first HARQ process is also referred to as a normal HARQ process. Full scheduling means that the UE receives a downlink grant at each TTI, and thus the HARQ process can be used to implement full scheduling of the UE. The second HARQ process retains the HARQ multiplexing gain in any case, and the second HARQ process is also referred to as a multiplexed HARQ process. In this embodiment of the invention, a combination of two types of HARQ processes is used to perform full scheduling and obtain the effect of HARQ multiplexing gain. For example, the protocol specifies that there are eight HARQ processes: HARQ process 0, HARQ process 1, HARQ process 2,..., And HARQ process 7. The eight HARQ processes are classified into two types. HARQ process 0 is a first HARQ process, and HARQ processes 1 to 7 are second HARQ processes. The HARQ processes 1 to 7 wait for feedback information of initial transmission scheduling and determine whether to perform retransmission. In this case, if the initial transmission fails in the HARQ processes 1 to 7, there is a possibility that retransmission will be performed. Therefore, there is a retransmission gain in the second HARQ processes 1 to 7. Since there is a time difference due to transmission delay between base stations, and HARQ processes 1-7 send feedback from one station to another, the UE does not have scheduling resources available for a certain period In this case, the HARQ process 0 can perform full scheduling of the user equipment.

  302. The UE receives the second downlink grant transmitted by the first base station at the second TTI using the second HARQ process and, according to the second downlink grant, by the first base station Demodulate the transmitted second downlink data, send a second feedback result corresponding to the second downlink data to the second base station, the second downlink data is the second state of the second state Carries 2 NDIs.

  In this embodiment of the present invention, the first base station transmits a second downlink grant to the UE with a second TTI using the second HARQ process, and the UE performs the second HARQ process. Use to receive the second downlink grant on the second TTI. The UE determines, from the second downlink grant, the frequency domain location at which the first base station transmits the second downlink data, and then the UE follows the second downlink grant to the second downlink Demodulate the data. The UE generates a second feedback result according to the reception status of the second downlink data, and then transmits a second feedback result corresponding to the second downlink data to the first base station. For example, if the UE correctly receives the second downlink data, the second feedback result includes ACK information, or if the UE receives the second downlink data in error, the second feedback result is Contains NACK information. Furthermore, the UE transmits the second downlink data first or the second downlink data according to the state of the second NDI carried in the second downlink data. It can be decided whether to retransmit.

  The second NDI carried by the second downlink data includes two states, a second state and a fourth state. The fourth state may be an inversion of the second state in the second NDI, and the second state may be an inversion of the fourth state. The second NDI is used to indicate to the UE whether the data for this HARQ process was first transmitted or retransmitted. If the value of the downlink data stored in the cache corresponding to the second HARQ process is different from the value of the second NDI, the UE considers that an initial transmission has occurred at this time, otherwise the UE Consider resending. If the UE determines that retransmission has been performed at this time, the UE can synthesize HARQ and obtain the multiplexing gain of the HARQ process. In this embodiment of the invention, it is mentioned that the first HARQ process is used to perform full scheduling of the UE and the second HARQ process is used to realize the multiplexing gain of the HARQ process. From the description of the contents of Therefore, from the description of step 301 and step 302, the UE can use two different HARQ processes with two different TTIs respectively, and transmit downlink data to the UE using both of the two types of HARQ processes. I understand that I can do it. By using two types of HARQ processes, not only full scheduling can be guaranteed, but also HARQ multiplexing gain can be obtained.

  303. The UE receives the third downlink grant transmitted by the first base station at the third TTI using the first HARQ process, and according to the third downlink grant, the first base station And demodulating the third downlink data transmitted by the second base station, transmitting a third feedback result corresponding to the third downlink data to the second base station, the third downlink data in the third state Carries the first NDI.

  In this embodiment of the invention, the UE receives the first downlink data, the UE transmits a first feedback result corresponding to the first downlink data to the second base station, and then The second base station transmits the first feedback result to the first base station. Similarly, the UE receives the second downlink data, the UE transmits a second feedback result corresponding to the second downlink data to the second base station, and then the second base station The feedback result of 2 is transmitted to the first base station. In the inter-station cooperation scenario between two base stations, there is certainly a transmission delay between the second base station and the first base station. Therefore, after the first base station transmits the first downlink data to the UE with the first TTI, before the first base station receives the first feedback result, the first base station uses Without a possible HARQ process, the first base station can still use the first HARQ process to send downlink data to the UE and perform full scheduling of the UE. For example, assuming that the third TTI is a TTI after the first TTI and the first base station does not receive the first feedback result at the third TTI, the first base station The HARQ process is used again to send the third downlink grant and third downlink data to the UE to perform full scheduling of the UE. The first NDI corresponding to the first HARQ process in the first TTI is in the first state and uses the first HARQ process again, the first TTI after the first TTI and the first in the third TTI When transmitting a third downlink data different from the downlink data, a state inversion needs to be performed for the first NDI corresponding to the first HARQ process, i.e. the first in the third state. Need to be carried in the third downlink data, and the third state is obtained by reversing the first state of the first NDI.

  In this embodiment of the present invention, the first base station again uses the first HARQ process to send a third downlink grant to the UE with a third TTI, and the UE uses the first HARQ process Using a third TTI to receive a third downlink grant. The UE determines, from the third downlink grant, the frequency domain location at which the first base station transmits the third downlink data, and then the UE follows the third downlink grant to the third downlink Demodulate the data. The UE generates a third feedback result according to reception status of the third downlink data, and then transmits a third feedback result corresponding to the third downlink data to the first base station.

  In some embodiments of the present invention, after step 302 is executed, the data processing method provided in this embodiment of the present invention further includes the following steps.

  D1. The UE receives the fifth downlink grant transmitted by the first base station at the fifth TTI using the first HARQ process and, according to the fifth downlink grant, the first base station The demodulated first downlink data transmitted by is demodulated, and the retransmitted first downlink data carries the first NDI in the first state.

  After the first base station transmits the first downlink data at the first TTI, before the first base station receives the first feedback result at the fifth TTI, the first base station The third downlink data is transmitted in the third TTI, and full scheduling of the UE is performed. After the first base station receives the first feedback result at the fifth TTI, the first base station can obtain the reception status of the first feedback result by the UE, i.e., the first base station The station can know whether the UE has correctly received the first downlink data. If the UE correctly receives the first downlink data, the first feedback result includes ACKnowledgment (ACK for short) information. If the UE receives the first downlink data in error, the first feedback result includes NACK information. When NACK information is included in the first feedback result, the first base station needs to retransmit the first downlink data to the UE, that is, needs to execute Step A1. The first base station uses the first HARQ process to transmit the UE with the fifth downlink grant and the retransmitted first downlink data with the fifth TTI, and the retransmitted first downlink The link data carries the first NDI in the first state, and the first state is obtained by inverting the third state of the first NDI. From step 203, if the first NDI corresponding to the first HARQ process in the third TTI is in the third state and step A1 is executed, it corresponds to the first HARQ process in the third TTI. It can be seen that the first NDI needs to be further inverted, in which case the first NDI is inverted to the first state.

  In some embodiments of the invention, the step 303 in which the UE receives the third downlink grant transmitted by the first base station at the third TTI using the first HARQ process is Can include the following steps.

  E1. The UE receives a third downlink grant transmitted by the first base station at a third TTI using the virtual HARQ process, and the virtual HARQ process corresponds to the first HARQ process.

  The first base station transmits the first downlink data and the second downlink data using the first HARQ process and the second HARQ process, respectively, and the first base station If the TTI determines that there is no HARQ process available, the first base station uses the virtual HARQ process to send the third downlink grant and third downlink data to the UE at the third TTI. And the virtual HARQ process corresponds to the first HARQ process. For example, in this embodiment of the present invention, if the downlink scheduling of the first base station is not full due to transmission delay between stations, multiple HARQ processes (eight HARQ processes are used as an example) are virtualized. The When the first base station scheduler finds that the actual HARQ process 0-7 is not available, it applies the HARQ process in the virtual HARQ process 8-15, and then the HARQ process is Mapping to a HARQ process (for example, modulo).

In some embodiments of the invention, step 303 where the third downlink data transmitted by the first base station is demodulated according to the third downlink grant comprises:
Receiving, by the UE, third downlink data according to the air interface resource indicated by the third downlink grant;
According to the first NDI in the third state carried in the third downlink data, the UE clears the first downlink data stored in the cache corresponding to the first HARQ process, and the first HARQ Writing third downlink data to a cache corresponding to the process.

  The UE receives a third downlink grant with a third TTI using the first HARQ process. The UE may obtain the air interface resource indicated by the third downlink grant and use the air interface resource to determine the frequency domain location where the third downlink data is transmitted, and then the UE Demodulates the third downlink data according to the third downlink grant. The state of the first NDI corresponding to the first HARQ process in the first TTI is the first state. If the third downlink data carries the first NDI in the third state, it indicates that the state of the first NDI corresponding to the first HARQ process has been reversed in the third TTI. In this case, the UE determines that the first base station transmits new downlink data, and clears the first downlink data stored in the cache corresponding to the first HARQ process.

  304. The UE receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process and follows the first downlink grant according to the fourth downlink grant. Demodulated the second downlink data retransmitted, transmitted to the second base station with a fourth feedback result corresponding to the second downlink data retransmitted, The downlink data carries the second NDI in the second state.

  In this embodiment of the invention, the fourth TTI is after the second TTI and the fourth TTI is after the third TTI. After the first base station transmits the second downlink data at the second TTI and before the first base station receives the second feedback result at the fourth TTI, the first base station The third downlink data is transmitted in the third TTI, and full scheduling of the UE is performed. In step 302, the UE transmits a second feedback result corresponding to the second downlink data to the second base station, the second base station receives the second feedback result, and the second base station The station forwards the second feedback result to the first base station. After there is a transmission delay between stations between the second base station and the first base station, the first base station after the first base station receives the second feedback result at the fourth TTI Transmits the retransmitted second downlink data to the UE in the fourth TTI according to the second feedback result NACK. The UE receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process and follows the first downlink grant according to the fourth downlink grant. Demodulated the second downlink data retransmitted, transmitted to the second base station with a fourth feedback result corresponding to the second downlink data retransmitted, The downlink data carries the second NDI in the second state. The state of the second NDI in the second TTI is the second state. Since the second downlink data needs to be retransmitted in the fourth TTI using the second HARQ process, the second NDI corresponding to the second HARQ process still maintains the second state, The UE decides that the first base station retransmits the second downlink data to the UE according to the second state used in the second NDI corresponding to the second HARQ process in the fourth TTI can do.

  In some embodiments of the invention, prior to step 304, where the UE receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process, Data processing method provided in this embodiment of the present invention The present invention further includes the following steps.

  F1. The UE receives the sixth downlink grant sent by the first base station at the sixth TTI using the first HARQ process, and follows the sixth downlink grant to the first base station The fourth downlink data transmitted by is demodulated, and the fourth downlink data carries the first NDI in the first state.

  After the first TTI, there is a sixth TTI in addition to the third TTI, and the sixth TTI is a TTI after the third TTI. Assuming that the first base station did not receive the first feedback result at the sixth TTI, the first base station uses the first HARQ process again to use the sixth downlink grant and the fourth The downlink data is transmitted, and full scheduling of the UE is performed. The UE receives the sixth downlink grant transmitted by the first base station at the sixth TTI using the first HARQ process, and according to the sixth downlink grant, the first base station The fourth downlink data transmitted by is demodulated. The first NDI corresponding to the first HARQ process in the third TTI is in the third state and uses the first HARQ process again, and then the third TTI in the sixth TTI after the third TTI. If a fourth downlink data different from the downlink data is transmitted again, it is necessary to perform a state reversal for the first NDI corresponding to the first HARQ process, i.e. the first state of the first state. One NDI needs to be carried in the fourth downlink data, and the first state is obtained by inverting the third state of the first NDI.

  In this embodiment of the present invention, after the first base station uses the first HARQ process to transmit the first downlink data to the UE, the first base station supports the first downlink data. Prior to receiving the first feedback result, the first base station performs full scheduling of the UE using the first HARQ process multiple times to transmit new downlink data to the UE. Note that you can.

  In some embodiments of the invention, step 304 is an implementation in which the UE receives the second downlink data retransmitted in the fourth TTI if the second feedback result sent by the UE is NACK. If the form is described and the second feedback result is ACK information, the data processing method provided in this embodiment of the present invention may further include the following steps.

  G1. After the UE receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process, the UE follows the fourth downlink grant according to the first downlink grant. The fifth downlink data transmitted by the base station is demodulated, and the fifth downlink data carries the second NDI in the fourth state.

  If the UE correctly receives the second downlink data, the second feedback result includes ACK information. If ACK information is included in the second feedback result, the first base station can send new downlink data (ie, fifth downlink data) to the UE, in which case the first base station The station needs to perform step G1. After the UE receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process, the UE follows the fourth downlink grant according to the fourth downlink grant. Demodulate fifth downlink data transmitted by one base station. The fifth downlink data carries the second NDI in the fourth state, the second NDI corresponding to the second HARQ process in the second TTI is in the second state, and the new downlink data is Transmitted in the fourth TTI, the fourth state is obtained by inverting the second state of the second NDI.

In some embodiments of the invention, demodulating 304 retransmitted second downlink data transmitted by the first base station according to a fourth downlink grant comprises:
Receiving, by the UE, the retransmitted second downlink data according to the air interface resource indicated by the fourth downlink grant;
The second downlink data stored in the cache corresponding to the second HARQ process is retransmitted by the UE according to the second NDI in the second state carried in the retransmitted second downlink data . combined with 2 downlink data may include a step of writing the synthesis results to the cache corresponding to the second HARQ process.

  The UE receives a fourth downlink grant with a fourth TTI using a second HARQ process. The UE may obtain the air interface resource indicated by the fourth downlink grant and use the radio interface resource to determine the frequency domain location where the retransmitted second downlink data is transmitted, The UE then demodulates the second downlink data retransmitted according to the fourth downlink grant. The state of the second NDI corresponding to the second HARQ process in the second TTI is the second state. If the retransmitted second downlink data carries the second NDI in the second state, it indicates that the state of the second NDI corresponding to the second HARQ process is not reversed in the fourth TTI. In this case, the UE determines that the first base station transmits the retransmitted second downlink data, and therefore the UE stores the second downlink stored in the cache corresponding to the second HARQ process. The data and the retransmitted second downlink data are combined to obtain the multiplexing gain of the HARQ process.

  From the above embodiment example of the present invention, in this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. I understand. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

  In order to better understand and implement the above-described solutions in the embodiments of the present invention, the following uses corresponding application scenarios as an example for detailed description.

  Hereinafter, as an example for explanation, a CA scenario in which inter-station cooperative transmission is performed between two base stations is used. The first base station is the base station where the SCC is located, and the second base station is the base station where the PCC is located. With respect to FIG. 4, FIG. 4 is a schematic diagram illustrating a processing procedure of one HARQ process when a transmission delay between stations according to an embodiment of the present invention is considered. This embodiment of the invention uses a new HARQ allocation solution. This embodiment of the present invention is applied to a scenario in which inter-station delay is large and cooperation is required, and can realize not only full scheduling but also HARQ multiplexing gain. In this embodiment of the present invention, not only can full scheduling be guaranteed, but also HARQ multiplexing gain can be obtained. The following uses an illustrative example.

  In this embodiment of the present invention, the HARQ process is classified into two types: a first HARQ process and a second HARQ process. The first HARQ process is a normal HARQ process and is used to guarantee full scheduling. The second HARQ process is a multiplexed HARQ process and is used to obtain HARQ multiplexing gain. Normal HARQ is used to maintain full scheduling of the UE when the SCC L2 scheduler determines that it cannot obtain multiplexed HARQ. Using multiplexed HARQ, retransmission or initial transmission is performed according to the fed back ACK / NACK information to obtain a multiplexing gain. There is certainly a retransmission gain in the multiplexed HARQ process.

  In the following, a total of eight HARQ processes from HARQ process 0 to HARQ process 7 are used as an example. Specifically, HARQ processes 0 and 1 will be described. Process 0 is a normal HARQ process, process 1 is a multiplexed HARQ process, and all other HARQ processes are waiting for feedback and are unavailable.

  As shown in FIG. 4, the processing procedure mainly includes the following steps.

  Step 1: At TTI0, the SCC L2 scheduler successfully applies HARQ process 0 and schedules the UE. The UE receives data and demodulates the data.

  Step 2: At TTI1, the SCC L2 scheduler successfully applies HARQ process 1 and schedules the UE. The UE receives data and demodulates the data.

  Step 3: In TTI4, the UE transmits the feedback result of HARQ process 0 to the PCC, and the PCC receives the feedback result and starts demodulation.

  Step 4: In TTI5, the UE transmits the feedback result of HARQ process 1 to the PCC, and the PCC receives the feedback result and starts demodulation.

  Step 5: At TTI7, the PCC obtains the result of HARQ process 0 by demodulation, sends the result to the SCC, and assumes that the result is NACK.

  Step 6: At TTI8, the SCC L2 scheduler applies the HARQ process, but all HARQ processes are used, there is no idle resource available, and the SCC L2 scheduler is a virtual HARQ corresponding to the normal HARQ process 0 Apply process 8 to perform full scheduling and reverse NDI. After receiving the scheduling at this point, the UE clears the HARQ process 0 buffer and replaces it with new data. From FIG. 4, it can be seen that the previous HARQ process 0 0 ms data is replaced by the new process 0 8 ms data.

  Step 7: At TTI8, the PCC demodulates the feedback result of HARQ process 1 and sends the result to the SCC, assuming that the feedback result is NACK.

  Step 8: At TTI9, the SCC L2 scheduler applies the HARQ process, but all HARQ processes are used and there are no idle resources available, so the SCC L2 scheduler corresponds to the normal HARQ process 0 Apply virtual HARQ process 9 to perform full scheduling and reverse NDI. After receiving the scheduling at this point, the UE clears the HARQ process 0 buffer and replaces it with new data. From FIG. 4 it can be seen that the HARQ process 0 8 ms data is replaced by the new process 0 9 ms data.

  Step 9: At TTI10, the SCC L2 scheduler applies the HARQ process, but all HARQ processes are used and there are no idle resources available, so the SCC L2 scheduler corresponds to the normal HARQ process 0 Apply virtual HARQ process 10 to perform full scheduling and reverse NDI. After receiving the scheduling at this point, the UE clears the HARQ process 0 buffer and replaces it with new data. From FIG. 4, it can be seen that the HARQ process 0 9 ms data is replaced with the new process 0 10 ms data.

Step 10: At TTI11, the SCC L2 scheduler receives the demodulation information at the time of TTI0 in HARQ process 0 fed back by the PCC. Since the feedback value is NACK, the SCC L2 scheduler needs to perform retransmission. Since retransmission cannot be performed using the HARQ process 0, retransmission at this time can be processed only as initial transmission, NDI is inverted, and retransmission gain is lost.

  Step 11: At TTI12, the SCC L2 receives the demodulation information at the time of TTI1 in the HARQ process 1 fed back by the PCC. Since the feedback value is NACK, the SCC L2 scheduler needs to perform retransmission. The SCC L2 scheduler applies HARQ process 1 according to the HARQ multiplexing gain solution and does not invert the NDI. After receiving the data, the UE combines the data with the data received at the time of TTI1, and the HARQ process 1 obtains the multiplexing gain.

  From the above embodiment example of the present invention, to the problem that the prior art cannot guarantee both full scheduling and HARQ multiplexing gain, this embodiment of the present invention flexibly classifies the HARQ process. It can be seen that, according to different functions of the two types of HARQ processes, a method capable of realizing full scheduling and obtaining HARQ multiplexing gain is realized. In a normal HARQ process and a multiplexed HARQ process, an initial block error rate (Initial Block Error Rate, IBLER for short) can be configured. The 1% IBLER is configured for the normal HARQ process and can improve the probability of accuracy of the initial transmission. The setting of the multiplexed HARQ process is the same as the existing default parameters in order to maintain the HARQ multiplexing gain. The purpose of setting the IBLER for a normal HARQ process to 1% is to ensure that 99% of the initial transmission is correct. Note that the normal HARQ process IBLER is flexible. For example, the IBLER of a normal HARQ process can be set to 5%, 10%, etc., and is not limited here.

  Note that the cross-station CA scenario is used as an example for the description of the present invention. If there is a transmission delay between stations between two or more base stations, the above data processing method can be used in this embodiment of the present invention, for example, it is necessary to exchange ACK / NACK between the stations. It should be understood that certain DPS, JT, SFN, etc. may be applied.

  It should be noted that for ease of explanation, each method embodiment described above is described as a combination of a series of operations. However, it should be understood by one of ordinary skill in the art that the present invention is not limited to the order of operations described, as some steps may be performed in a different order or simultaneously according to the present invention. .

  In order to more easily implement the above-described solutions in the embodiments of the present invention, the following further provides related devices for implementing the above-mentioned solutions.

  With respect to FIG. 5-a, one embodiment of the present invention provides a base station 500, which may specifically be a first base station. The base station 500 can include a first data processing module 501, a second data processing module 502, a third data processing module 503, and a fourth data processing module 504.

  The first data processing module 501 uses the first hybrid automatic repeat request (HARQ) process to deliver the first downlink grant and the first downlink data in the first transmission time interval (TTI) to the user equipment Configured to transmit to the (UE), the first downlink data carries a first new data indicator (NDI) in a first state.

  The second data processing module 502 is configured to transmit the second downlink grant and the second downlink data to the UE in the second TTI using the second HARQ process, and the second downlink The link data carries the second NDI in the second state.

  The third data processing module 503 is configured to transmit the third downlink grant and the third downlink data to the UE at the third TTI using the first HARQ process, and the third downlink The link data carries the first NDI in the third state, and the third state is obtained by inverting the first state of the first NDI.

  The fourth data processing module 504 receives the second feedback result transmitted by the second base station and corresponding to the second downlink data at the fourth TTI, and includes the negation included in the second feedback result. According to the response (NACK) information, the fourth downlink grant and retransmitted second downlink data is transmitted to the UE at the fourth TTI using the second HARQ process, and the retransmitted second The downlink data is configured to carry a second NDI in a second state and there is a transmission delay between stations between the second base station and the first base station.

  In some embodiments of the invention, with respect to FIG. 5-b, the first base station 500 transmits the first TSI transmitted by the second base station and corresponding to the first downlink data at the fifth TTI. The fifth downlink grant and retransmitted first downlink data according to the NACK information included in the first feedback result at the fifth TTI using the first HARQ process Is the fifth data processing module 505 configured to transmit to the UE, the retransmitted first downlink data carries the first NDI in the first state, and the first state is the first 5th data processing, obtained by inverting the 3rd state of 1 NDI, the time difference between the 4th TTI and the 2nd TTI is equal to the time difference between the 5th TTI and the 1st TTI Module 505 is further included.

  In some embodiments of the present invention, referring to FIG. 5-c with respect to FIG. 5-a, the first base station 500 uses the first HARQ process when the third data processing module uses the first HARQ process. After sending 3rd downlink grant and 3rd downlink data to UE in 3rd TTI, 6th downlink grant and 4th downlink in 6th TTI using 1st HARQ process A sixth data processing module 506 configured to transmit link data to the UE, wherein the fourth downlink data carries a first NDI in a first state, and the first state is a first Further included is a sixth data processing module 506 obtained by inverting the third state of the NDI.

  In some embodiments of the invention, the third data processing module 503 uses the virtual HARQ process if the first base station determines that there is no HARQ process available at the third TTI. And transmitting the third downlink grant and the third downlink data to the UE in the third TTI, and the virtual HARQ process is specifically configured to correspond to the first HARQ process.

  In some embodiments of the invention, the fourth data processing module 504 has received a second feedback result transmitted by the second base station and corresponding to the second downlink data at a fourth TTI. Later, according to the acknowledgment (ACK) information contained in the second feedback result, the fourth downlink grant and the fifth downlink data are transmitted to the UE at the fourth TTI using the second HARQ process. And the fifth downlink data carries a second NDI in a fourth state, wherein the fourth state is obtained by inverting the second state of the second NDI.

  From the above example embodiment of the present invention, the first base station transmits the first downlink grant and the first downlink data to the UE in the first TTI using the first HARQ process. The first downlink data carries the first NDI in the first state, the first base station uses the second HARQ process, the second downlink grant and the second downlink data To the UE in the second TTI, the second downlink data carries the second NDI in the second state, and the first base station receives the third downlink grant and the third downlink Link data is sent to the UE in a third TTI using the first HARQ process, the third downlink data carries the first NDI in the third state, and the third state is the first Obtained by inverting the first state of the NDI, the first base station is transmitted by the second base station at the fourth TTI and into the second downlink data The first base station receives the corresponding second feedback result, and the first base station uses the second HARQ process in the fourth TTI according to the negative acknowledgment (NACK) information included in the second feedback result. 4 downlink grants and retransmitted second downlink data are transmitted to the UE, and the retransmitted second downlink data carries the second NDI in the second state, and the second base station It can be seen that the transmission delay between the stations with the first base station is the time difference between the fourth TTI and the first TTI. In this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

  With respect to FIG. 6-a, one embodiment of the present invention provides a UE 600. The UE 600 can include a first data processing module 601, a second data processing module 602, a third data processing module 603, and a fourth data processing module 604.

  The first data processing module 601 uses the first hybrid automatic repeat request (HARQ) process to receive the first downlink grant sent by the first base station in the first transmission time interval (TTI). Receiving and demodulating the first downlink data transmitted by the first base station according to the first downlink grant and sending the first feedback result corresponding to the first downlink data to the second base station There is an inter-station transmission delay between the second base station and the first base station, and the first downlink data carries the first new data indicator (NDI) in the first state Configured to be.

  The second data processing module 602 receives the second downlink grant sent by the first base station at the second TTI using the second HARQ process, and according to the second downlink grant Demodulating the second downlink data transmitted by the first base station, transmitting a second feedback result corresponding to the second downlink data to the second base station, and second downlink data Is configured to carry a second NDI in a second state.

  The third data processing module 603 receives the third downlink grant transmitted by the first base station at the third TTI using the first HARQ process, and according to the third downlink grant Demodulating the third downlink data transmitted by the first base station, transmitting a third feedback result corresponding to the third downlink data to the second base station, and third downlink data Is configured to carry a first NDI in a third state.

  The fourth data processing module 604 receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process, and according to the fourth downlink grant The second downlink data transmitted by the first base station is demodulated, and the fourth feedback result corresponding to the retransmitted second downlink data is transmitted to the second base station. The retransmitted second downlink data is configured to carry the second NDI in the second state.

  In some embodiments of the invention, referring to FIG. 6-b with respect to FIG. 6-a, the UE 600 transmits by the first base station at the fifth TTI using the first HARQ process. Configured to demodulate the retransmitted first downlink data transmitted by the first base station in accordance with the fifth downlink grant. The data processing module 605 may further include a fifth data processing module 605, wherein the retransmitted first downlink data carries a first NDI in a first state.

  In some embodiments of the present invention, referring to FIG. 6-c with respect to FIG. 6-a, the UE 600 may cause the fourth data processing module to use the second HARQ process at the fourth TTI. Before receiving the fourth downlink grant sent by the first base station, at the sixth TTI using the first HARQ process, the sixth down sent by the first base station A sixth data processing module 606 configured to receive the link grant and demodulate the fourth downlink data transmitted by the first base station according to the sixth downlink grant, comprising: The downlink data may further include a sixth data processing module 606 that carries the first NDI in the first state.

  In some embodiments of the invention, the third data processing module 603 receives a third downlink grant sent by the first base station at a third TTI using a virtual HARQ process. Specifically, the virtual HARQ process corresponds to the first HARQ process.

  In some embodiments of the invention, the fourth data processing module 604 is further configured to demodulate the fifth downlink data transmitted by the first base station according to the fourth downlink grant. The fifth downlink data carries the second NDI in the fourth state.

  In some embodiments of the invention, the third data processing module 603 receives the third downlink data according to the air interface resource indicated by the third downlink grant, and the third downlink data According to the first NDI in the third state carried, clear the first downlink data stored in the cache corresponding to the first HARQ process, and the third in the cache corresponding to the first HARQ process Specifically configured to write downlink data.

In some embodiments of the invention, the fourth data processing module 604 receives the retransmitted second downlink data according to the air interface resource indicated by the fourth downlink grant, The second downlink data retransmitted from the second downlink data stored in the cache corresponding to the second HARQ process according to the second NDI in the second state carried in the second downlink data; It is specifically configured to synthesize and write the synthesis result to the cache corresponding to the second HARQ process.

  From the above embodiment example of the present invention, in this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. I understand. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

  The information exchange between the modules / units of the apparatus and the execution process thereof are based on the same concept as the method embodiment of the present invention, and have the same technical effect as the method embodiment of the present invention. Please note that. For specific contents, refer to the above description of the method embodiment of the present invention, and a detailed description thereof will be omitted.

  In one embodiment of the present invention, a computer storage medium is further provided. The computer storage medium stores a program, which executes some or all of the steps described in the foregoing method embodiments.

Hereinafter, another base station provided in the embodiment of the present invention will be described. Specifically, the base station is the first base station. With reference to FIG. 7, the base station 700
Including a receiver 701, a transmitter 702, a processor 703, and a memory 704 (the base station 700 may have one or more processors 703, and in FIG. 7, one processor is used as an example. ) In some embodiments of the invention, the receiver 701, transmitter 702, processor 703, and memory 704 may be connected using a bus or may be connected in another manner. FIG. 7 shows an example of connection using a bus.

The processor 703
Transmitting a first downlink grant and first downlink data to a user equipment (UE) at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process; The first downlink data carries a first new data indicator (NDI) in a first state, and
Transmitting second downlink grant and second downlink data to the UE in a second TTI using a second HARQ process, wherein the second downlink data is in a second state; Carrying a second NDI; and
Transmitting a third downlink grant and third downlink data to the UE in a third TTI using a first HARQ process, wherein the third downlink data is in a third state; Carrying a first NDI and the third state is obtained by inverting the first state of the first NDI; and
At the fourth TTI, the second feedback result transmitted by the second base station and corresponding to the second downlink data is received, and the first at the fourth TTI using the second HARQ process The base station transmits the fourth downlink grant and the retransmitted second downlink data to the UE according to the negative acknowledgment (NACK) information included in the second feedback result, wherein the retransmitted first The second downlink data carries the second NDI in the second state, and there is a transmission delay between the stations between the second base station and the first base station. Is done.

In some embodiments of the invention, the processor 703
At the fifth TTI, receive the first feedback result transmitted by the second base station and corresponding to the first downlink data, and at the fifth TTI using the first HARQ process, the first Transmitting the fifth downlink grant and the retransmitted first downlink data to the UE according to the NACK information included in the feedback result of the first base station, the retransmitted first downlink The data carries the first NDI in the first state, the first state is obtained by inverting the third state of the first NDI, and the time difference between the fourth TTI and the second TTI is Is further configured to perform a step equal to a time difference between the fifth TTI and the first TTI.

In some embodiments of the invention, the processor 703
After sending the third downlink grant and the third downlink data to the UE at the third TTI using the first HARQ process, at the sixth TTI using the first HARQ process Transmitting a sixth downlink grant and fourth downlink data to the UE, wherein the fourth downlink data carries a first NDI in a first state, and the first state is a first It is further configured to perform the steps obtained by inverting the third state of the NDI.

In some embodiments of the invention, the processor 703
If the first base station determines that there is no HARQ process available in the third TTI, the third downlink grant and the third downlink data in the third TTI using the virtual HARQ process The virtual HARQ process is specifically configured to perform the steps corresponding to the first HARQ process.

  In some embodiments of the invention, the processor 703 receives the second feedback result transmitted by the second base station and corresponding to the second downlink data after receiving the second TTI at the fourth TTI. Transmitting a fourth downlink grant and fifth downlink data to the UE at a fourth TTI using the HARQ process according to the acknowledgment (ACK) information included in the second feedback result, The fifth downlink data carries the second NDI in the fourth state, the fourth state is obtained by inverting the second state of the second NDI, further to perform the steps Composed.

  From the above example embodiment of the present invention, the first base station transmits the first downlink grant and the first downlink data to the UE in the first TTI using the first HARQ process. The first downlink data carries the first NDI in the first state, the first base station uses the second HARQ process, the second downlink grant and the second downlink data To the UE in the second TTI, the second downlink data carries the second NDI in the second state, and the first base station receives the third downlink grant and the third downlink Link data is sent to the UE in a third TTI using the first HARQ process, the third downlink data carries the first NDI in the third state, and the third state is the first Obtained by inverting the first state of the NDI, the first base station is transmitted by the second base station at the fourth TTI and into the second downlink data The first base station receives the corresponding second feedback result, and the first base station uses the second HARQ process in the fourth TTI according to the negative acknowledgment (NACK) information included in the second feedback result. 4 downlink grants and retransmitted second downlink data are transmitted to the UE, and the retransmitted second downlink data carries the second NDI in the second state, and the second base station It can be seen that the transmission delay between the stations with the first base station is the time difference between the fourth TTI and the first TTI. In this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

In the following, another UE provided in an embodiment of the present invention will be described. With reference to FIG.
It includes a receiver 801, a transmitter 802, a processor 803, and a memory 804 (one or more processors 803 may be present in the UE 800, and one processor is used as an example in FIG. 8). In some embodiments of the invention, the receiver 801, transmitter 802, processor 803, and memory 804 may be connected using a bus or otherwise connected. FIG. 8 shows an example of connection using a bus.

The processor 803
Receiving a first downlink grant transmitted by a first base station at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process, and the first downlink Demodulating the first downlink data transmitted by the first base station according to the permission, and transmitting the first feedback result corresponding to the first downlink data to the second base station, There is an inter-station transmission delay between the second base station and the first base station, and the first downlink data carries a first new data indicator (NDI) in a first state; and ,
The second downlink grant transmitted by the first base station is received at the second TTI using the second HARQ process, and transmitted by the first base station according to the second downlink grant. Demodulating the second downlink data and transmitting a second feedback result corresponding to the second downlink data to the second base station, wherein the second downlink data is in the second state Carrying a second NDI of the
Received the third downlink grant sent by the first base station at the third TTI using the first HARQ process and sent by the first base station according to the third downlink grant Demodulating the third downlink data and transmitting a third feedback result corresponding to the third downlink data to the second base station, wherein the third downlink data is in a third state Carrying the first NDI of
In the fourth TTI using the second HARQ process, the fourth downlink grant transmitted by the first base station is received and transmitted by the first base station according to the fourth downlink grant. Further, demodulating the retransmitted second downlink data and transmitting a fourth feedback result corresponding to the retransmitted second downlink data to the second base station, the retransmitted first downlink data The second downlink data is configured to carry the step of carrying the second NDI in the second state.

In some embodiments of the invention, the processor 803 is
Receives the fifth downlink grant sent by the first base station at the fifth TTI using the first HARQ process and is sent by the first base station according to the fifth downlink grant. Further configured to perform the step of demodulating the retransmitted first downlink data, wherein the retransmitted first downlink data carries the first NDI in the first state Is done.

  In some embodiments of the invention, prior to receiving a fourth downlink grant transmitted by the first base station at a fourth TTI using a second HARQ process, processor 803 Receives the sixth downlink grant sent by the first base station at the sixth TTI using the first HARQ process and, according to the sixth downlink grant, by the first base station Demodulating the transmitted fourth downlink data, wherein the fourth downlink data is further configured to perform the step of carrying the first NDI in the first state.

In some embodiments of the invention, the processor 803 is
Receiving a third downlink grant sent by the first base station at a third TTI using a virtual HARQ process, the virtual HARQ process corresponding to the first HARQ process; It is specifically configured to execute the steps.

  In some embodiments of the invention, the processor 803 receives the fourth downlink grant transmitted by the first base station at the fourth TTI using the second HARQ process, Demodulating fifth downlink data transmitted by the first base station according to a fourth downlink grant, the fifth downlink data carrying a second NDI in a fourth state , Further configured to perform the steps.

In some embodiments of the invention, the processor 803 is
Receiving third downlink data according to the air interface resource indicated by the third downlink grant;
According to the first NDI in the third state carried in the third downlink data, the first downlink data stored in the cache corresponding to the first HARQ process is cleared and passed to the first HARQ process. And writing the third downlink data to the corresponding cache.

In some embodiments of the invention, the processor 803 is
Receiving the retransmitted second downlink data according to the air interface resource indicated by the fourth downlink grant;
In accordance with the second NDI in the second state carried in the retransmitted second downlink data, the second downlink data stored in the cache corresponding to the second HARQ process has been retransmitted . A step of combining with the downlink data and writing the combined result to the cache corresponding to the second HARQ process.

  From the above embodiment example of the present invention, in this embodiment of the present invention, the first base station classifies the HARQ process into two types of processes: a first HARQ process and a second HARQ process. I understand. The first HARQ process is used by the first base station to transmit downlink data to the UE with the first TTI and the third TTI to perform full scheduling of the UE and thereby the air interface Resource utilization can be improved. If there is a transmission delay between stations between the first base station and the second base station, the first base station receives the second feedback result at the fourth TTI, and the first base station Retransmit the second downlink data using the second HARQ process. Since the state of the second NDI carried in the retransmitted second downlink data is not reversed (ie, the second NDI is still in the second state), the UE is in the second state According to the second NDI, the second downlink data transmitted by the first base station at the second TTI and the retransmitted second down transmitted by the first base station at the fourth TTI. The link data can be jointly decoded, so the second HARQ process can achieve the multiplexing gain of the HARQ process.

  It is further noted that the described apparatus embodiment is merely an example. Units listed as separate parts may or may not be physically separated, and parts displayed as units may or may not be physical units and are located in one position. May be distributed over a plurality of network units. Some or all modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. Further, in the accompanying drawings of the embodiments of the apparatus provided by the present invention, the connection relationship between the modules indicates that the modules have communication connections with each other, specifically as one or more communication buses or signal cables. May be implemented. One skilled in the art can understand and implement the embodiments of the present invention without creative efforts.

  Based on the above description of the embodiments, those skilled in the art will realize that the present invention is realized by software in addition to the necessary general-purpose hardware or by dedicated hardware including a dedicated integrated circuit, a dedicated CPU, a dedicated memory, a dedicated component, and the like You can clearly understand what can be done. In general, functions that can be executed by a computer program can be easily realized by using corresponding hardware. Further, the specific hardware configuration used for realizing the same function may be in various forms such as an analog circuit, a digital circuit, and a dedicated circuit. However, for the present invention, in many cases, the implementation of the software program is a better implementation. Based on this understanding, basically the technical solution of the present invention or the part contributing to the prior art can be realized in the form of a software product. Software products can be stored on readable storage media such as floppy disks, USB flash drives, removable hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or computer optical disks. Contains several instructions for instructing a computer device (which may be a personal computer, server, network device, etc.) to perform the method described in the embodiments of the present invention.

  The foregoing embodiments are not intended to limit the present invention, but merely to illustrate the technical solutions of the present invention. Although the present invention has been described in detail in connection with the foregoing embodiments, those skilled in the art will recognize that the technical aspects described in the preceding embodiments have not departed from the spirit and scope of the technical solutions of the embodiments of the invention. It should be understood that further modifications to the solution can be made, or equivalent replacements can be made for some of its technical features.

500 First base station
501 First data processing module
502 Second data processing module
503 Third data processing module
504 Fourth data processing module
505 5th data processing module
506 6th data processing module
601 First data processing module
602 Second data processing module
603 Third data processing module
604 Fourth data processing module
605 Fifth data processing module
606 Sixth data processing module
700 base station
701 receiver
702 transmitter
703 processor
704 memory
800 User equipment
801 receiver
802 transmitter
803 processor
804 memory

Claims (8)

A data scheduling method comprising:
A first base station sends a first downlink grant and first downlink data to a mobile device at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process. Transmitting, wherein the first downlink data carries a first new data indicator (NDI) in a first state;
Transmitting, by the first base station, a second downlink grant and second downlink data to the mobile device at a second TTI using a second HARQ process, the second base station comprising: The second downlink data carries a second NDI in a second state, and
Transmitting, by the first base station, a third downlink grant and third downlink data to the mobile device at a third TTI using the first HARQ process, comprising: Third downlink data carries the first NDI in a third state, wherein the third state is obtained by inverting the first state of the first NDI; and
The first base station receives a second feedback result transmitted by the second base station and corresponding to the second downlink data by a fourth TTI, and the first base station According to a negative acknowledgment (NACK) information included in the second feedback result, a fourth downlink grant and retransmitted second downlink data is sent to the fourth TTI using the second HARQ process. Wherein the retransmitted second downlink data carries the second NDI in the second state, and the second base station and the first base There is a transmission delay between the stations, and the step ,
The first base station receives a first feedback result transmitted by the second base station and corresponding to the first downlink data at a fifth TTI, and is transmitted by the first base station. , According to the NACK information included in the first feedback result, a fifth downlink grant and retransmitted first downlink data is transmitted to the mobile at the fifth TTI using the first HARQ process. Transmitting to the device, wherein the retransmitted first downlink data carries the first NDI in the first state, and the first state is the third NDI of the first NDI. And the time difference between the fourth TTI and the second TTI is equal to the time difference between the fifth TTI and the first TTI . After the step of transmitting a third downlink grant and third downlink data by the first base station to the mobile device at a third TTI using the first HARQ process; The method is
Transmitting, by the first base station, a sixth downlink grant and fourth downlink data to the mobile device at a sixth TTI using the first HARQ process, comprising: A fourth downlink data carrying the first NDI in the first state, wherein the first state is obtained by inverting the third state of the first NDI, further comprising: The method of claim 1 comprising: Transmitting by the first base station a third downlink grant and third downlink data to the mobile device at a third TTI using the first HARQ process; and
If the first base station determines that there is no HARQ process available in the third TTI, the first base station allows the third downlink grant and the third downlink data. and a step of transmitting to the mobile device in the third TTI using virtual HARQ process, the virtual HARQ process corresponding to the first HARQ process, comprising the steps, according to claim 1 or 2 The method described in 1. After the step of receiving by a first TTI a second feedback result transmitted by a second base station and corresponding to the second downlink data at a fourth TTI, the method comprises:
The first base station uses the second HARQ process to send the fourth downlink grant and fifth downlink data according to acknowledgment (ACK) information included in the second feedback result. Transmitting to the mobile device at the fourth TTI, wherein the fifth downlink data carries the second NDI in a fourth state, and the fourth state is the second TTI. The method according to claim 1 or 2 , further comprising the step of obtaining by inverting the second state of NDI. A base station, in particular the base station is a first base station, and the first base station is
Configured to send first downlink grant and first downlink data to a mobile device at a first transmission time interval (TTI) using a first hybrid automatic repeat request (HARQ) process A first data processing module, wherein the first downlink data carries a first new data indicator (NDI) in a first state;
A second data processing module configured to transmit a second downlink grant and second downlink data to the mobile device at a second TTI using a second HARQ process; The second downlink data carries a second NDI in a second state, a second data processing module;
A third data processing module configured to transmit a third downlink grant and third downlink data to the mobile device at a third TTI using the first HARQ process; The third downlink data carries the first NDI in a third state, and the third state is obtained by inverting the first state of the first NDI, Data processing modules
A second feedback result transmitted by a second base station and corresponding to the second downlink data is received at a fourth TTI, and according to negative acknowledgment (NACK) information included in the second feedback result A fourth data configured to transmit a fourth downlink grant and retransmitted second downlink data to the mobile device at the fourth TTI using the second HARQ process. A processing module, wherein the retransmitted second downlink data carries the second NDI in the second state, and a station between the second base station and the first base station. A fourth data processing module, with a transmission delay between ,
A first feedback result transmitted by the second base station and corresponding to the first downlink data is received at a fifth TTI, and according to NACK information included in the first feedback result, a fifth feedback is received. A fifth data processing module configured to transmit the downlink grant and retransmitted first downlink data to the mobile device at the fifth TTI using the first HARQ process The retransmitted first downlink data carries the first NDI in the first state, and the first state inverts the third state of the first NDI. And a fifth data processing module, wherein the time difference between the fourth TTI and the second TTI is equal to the time difference between the fifth TTI and the first TTI . The first base station is
After the third data processing module transmits the third downlink grant and the third downlink data to the mobile device at the third TTI using the first HARQ process; A sixth data processing module configured to transmit a sixth downlink grant and a fourth downlink data to the mobile device at a sixth TTI using the first HARQ process; The fourth downlink data carries the first NDI in the first state, and the first state is obtained by inverting the third state of the first NDI, 6. The base station according to claim 5 , further comprising six data processing modules. The third data processing module, when the first base station determines that there is no HARQ process available in the third TTI, the third downlink grant and the third downlink 7. The data of claim 5 or 6 , further configured to transmit data to the mobile device at the third TTI using a virtual HARQ process, wherein the virtual HARQ process corresponds to the first HARQ process. The listed base station. After receiving the second feedback result transmitted by the second base station and corresponding to the second downlink data at the fourth TTI, the fourth data processing module is configured to receive the second data. The fourth downlink grant and fifth downlink data to the mobile device at the fourth TTI using the second HARQ process according to acknowledgment (ACK) information included in the feedback result of Further configured to transmit, wherein the fifth downlink data carries the second NDI in a fourth state, and the fourth state represents the second state of the second NDI. The base station according to claim 5 or 6 , which is obtained by inverting.

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